<template>
  <div class="page-login">
    <div class="page-login--layer page-login--layer-area">
      <ul class="circles">
        <li v-for="n in 10" :key="n"></li>
      </ul>
    </div>
    <div
      class="page-login--layer page-login--layer-time"
      flex="main:center cross:center">
      {{time}}
    </div>
    <div class="page-login--layer">
      <div
        class="page-login--content"
        flex="dir:top main:justify cross:stretch box:justify">
        <div class="page-login--content-header">

        </div>
        <div
          class="page-login--content-main"
          flex="dir:top main:center cross:center">
          <!-- logo -->
          <img class="page-login--logo" src="./image/logo@2x.png">
          <!-- form -->
          <div class="page-login--form">
            <el-card shadow="never">
              <el-form
                ref="loginForm"
                label-position="top"
                :rules="rules"
                :model="formLogin"
                size="default">
                <el-form-item prop="username">
                  <el-input
                    type="text"
                    v-model="formLogin.username"
                    placeholder="用户名">
                    <i slot="prepend" class="fa fa-user-circle-o"></i>
                  </el-input>
                </el-form-item>
                <el-form-item prop="password">
                  <el-input
                    type="password"
                    v-model="formLogin.password"
                    placeholder="密码">
                    <i slot="prepend" class="fa fa-keyboard-o"></i>
                  </el-input>
                </el-form-item>
                <el-form-item prop="code">
                  <el-input
                    type="text"
                    v-model="formLogin.code"
                    placeholder="验证码" @keypress.native="enterSubmit($event)">
                    <template slot="append">
                      <img class="login-code" :src="captchaImage" @click="refreshCaptcha()">
                    </template>
                  </el-input>
                </el-form-item>
                <el-button
                  size="default"
                  @click="submit"
                  type="primary"
                  class="button-login">
                  登录
                </el-button>
              </el-form>
            </el-card>
            <p
              class="page-login--options"
              flex="main:justify cross:center">
              <span><d2-icon name="question-circle"/> 忘记密码</span>
              <span>注册用户</span>
            </p>
          </div>
        </div>
        <div class="page-login--content-footer">
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import dayjs from 'dayjs'
  import {mapActions} from 'vuex'
  import localeMixin from '@/locales/mixin.js'

  export default {
    mixins: [
      localeMixin
    ],
    data() {
      return {
        timeInterval: null,
        time: dayjs().format('HH:mm:ss'),
        captchaImage: '',
        image_uuid: '',
        // 表单
        formLogin: {
          username: '',
          password: '',
          code: '',
        },
        // 表单校验
        rules: {
          username: [
            {
              required: true,
              message: '请输入用户名',
              trigger: 'blur'
            }
          ],
          password: [
            {
              required: true,
              message: '请输入密码',
              trigger: 'blur'
            }
          ],
          code: [
            {
              required: true,
              message: '请输入验证码',
              trigger: 'blur'
            }
          ]
        }
      }
    },
    mounted() {
      this.getCaptcha();
      this.timeInterval = setInterval(() => {
        this.refreshTime()
      }, 1000)
    },
    beforeDestroy() {
      clearInterval(this.timeInterval)
    },
    methods: {
      ...mapActions('d2admin/account', [
        'login'
      ]),
      refreshTime() {
        this.time = dayjs().format('HH:mm:ss')
      },
      // 生成随机uuid
      generate_uuid() {
        var d = new Date().getTime();
        if (window.performance && typeof window.performance.now === "function") {
          d += performance.now(); //use high-precision timer if available
        }
        var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
          var r = (d + Math.random() * 16) % 16 | 0;
          d = Math.floor(d / 16);
          return (c == 'x' ? r : (r & 0x3 | 0x8)).toString(16);
        });
        return uuid;
      },
      // 获取验证码图片
      getCaptcha() {
        this.image_uuid = this.generate_uuid()
        this.captchaImage = "http://127.0.0.1:8000/users/captcha/" + this.image_uuid + "/v1/"
      },
      // 刷新验证码
      refreshCaptcha() {
        this.getCaptcha()
      },
      /*
       * @description 提交表单
      */
      // 提交登录信息
      submit() {
        this.$refs.loginForm.validate((valid) => {
          if (valid) {
            // 登录
            this.login({
              username: this.formLogin.username,
              password: this.formLogin.password,
              code: this.formLogin.code,
              image_uuid: this.image_uuid
            })
              .then(() => {
                // 重定向对象不存在则返回顶层路径
                this.$router.replace(this.$route.query.redirect || '/')
              })
              .catch(() => {
                // 刷新验证码
                this.refreshCaptcha()
                this.formLogin.code = ''
              })
          } else {
            // 刷新验证码
            this.refreshCaptcha()
            // 登录表单校验失败
            this.$message.error('表单校验失败，请检查')
          }
        })
      },
      enterSubmit(event) {
        if (event.keyCode === 13) {
          // console.log(13)
          this.submit()
        }
      }
    }
  }
</script>

<style lang="scss">
  .page-login {
    @extend %unable-select;
    $backgroundColor: #F0F2F5;
    // ---
    background-color: $backgroundColor;
    height: 100%;
    position: relative;
    // 层
    .page-login--layer {
      @extend %full;
      overflow: auto;
    }

    .page-login--layer-area {
      overflow: hidden;
    }

    // 时间
    .page-login--layer-time {
      font-size: 24em;
      font-weight: bold;
      color: rgba(0, 0, 0, 0.03);
      overflow: hidden;
    }

    // 登陆页面控件的容器
    .page-login--content {
      height: 100%;
      min-height: 500px;
    }

    // header
    .page-login--content-header {
      padding: 1em 0;

      .page-login--content-header-motto {
        margin: 0px;
        padding: 0px;
        color: $color-text-normal;
        text-align: center;
        font-size: 12px;
      }
    }

    // main
    .page-login--logo {
      width: 240px;
      margin-bottom: 2em;
      margin-top: -2em;
    }

    // 登录表单
    .page-login--form {
      width: 280px;
      // 卡片
      .el-card {
        margin-bottom: 15px;
      }

      // 登录按钮
      .button-login {
        width: 100%;
      }

      // 输入框左边的图表区域缩窄
      .el-input-group__prepend {
        padding: 0px 14px;
      }

      .login-code {
        height: 40px - 2px;
        display: block;
        margin: 0px -20px;
        border-top-right-radius: 2px;
        border-bottom-right-radius: 2px;
      }

      // 登陆选项
      .page-login--options {
        margin: 0px;
        padding: 0px;
        font-size: 14px;
        color: $color-primary;
        margin-bottom: 15px;
        font-weight: bold;
      }

      .page-login--quick {
        width: 100%;
      }
    }

    // 快速选择用户面板
    .page-login--quick-user {
      @extend %flex-center-col;
      padding: 10px 0px;
      border-radius: 4px;

      &:hover {
        background-color: $color-bg;

        i {
          color: $color-text-normal;
        }

        span {
          color: $color-text-normal;
        }
      }

      i {
        font-size: 36px;
        color: $color-text-sub;
      }

      span {
        font-size: 12px;
        margin-top: 10px;
        color: $color-text-sub;
      }
    }

    // footer
    .page-login--content-footer {
      padding: 1em 0;

      .page-login--content-footer-locales {
        padding: 0px;
        margin: 0px;
        margin-bottom: 15px;
        font-size: 12px;
        line-height: 12px;
        text-align: center;
        color: $color-text-normal;

        a {
          color: $color-text-normal;
          margin: 0 .5em;

          &:hover {
            color: $color-text-main;
          }
        }
      }

      .page-login--content-footer-copyright {
        padding: 0px;
        margin: 0px;
        margin-bottom: 10px;
        font-size: 12px;
        line-height: 12px;
        text-align: center;
        color: $color-text-normal;

        a {
          color: $color-text-normal;
        }
      }

      .page-login--content-footer-options {
        padding: 0px;
        margin: 0px;
        font-size: 12px;
        line-height: 12px;
        text-align: center;

        a {
          color: $color-text-normal;
          margin: 0 1em;
        }
      }
    }

    // 背景
    .circles {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      overflow: hidden;
      margin: 0px;
      padding: 0px;

      li {
        position: absolute;
        display: block;
        list-style: none;
        width: 20px;
        height: 20px;
        background: #FFF;
        animation: animate 25s linear infinite;
        bottom: -200px;
        @keyframes animate {
          0% {
            transform: translateY(0) rotate(0deg);
            opacity: 1;
            border-radius: 0;
          }
          100% {
            transform: translateY(-1000px) rotate(720deg);
            opacity: 0;
            border-radius: 50%;
          }
        }

        &:nth-child(1) {
          left: 15%;
          width: 80px;
          height: 80px;
          animation-delay: 0s;
        }

        &:nth-child(2) {
          left: 5%;
          width: 20px;
          height: 20px;
          animation-delay: 2s;
          animation-duration: 12s;
        }

        &:nth-child(3) {
          left: 70%;
          width: 20px;
          height: 20px;
          animation-delay: 4s;
        }

        &:nth-child(4) {
          left: 40%;
          width: 60px;
          height: 60px;
          animation-delay: 0s;
          animation-duration: 18s;
        }

        &:nth-child(5) {
          left: 65%;
          width: 20px;
          height: 20px;
          animation-delay: 0s;
        }

        &:nth-child(6) {
          left: 75%;
          width: 150px;
          height: 150px;
          animation-delay: 3s;
        }

        &:nth-child(7) {
          left: 35%;
          width: 200px;
          height: 200px;
          animation-delay: 7s;
        }

        &:nth-child(8) {
          left: 50%;
          width: 25px;
          height: 25px;
          animation-delay: 15s;
          animation-duration: 45s;
        }

        &:nth-child(9) {
          left: 20%;
          width: 15px;
          height: 15px;
          animation-delay: 2s;
          animation-duration: 35s;
        }

        &:nth-child(10) {
          left: 85%;
          width: 150px;
          height: 150px;
          animation-delay: 0s;
          animation-duration: 11s;
        }
      }
    }
  }
</style>
